Question

an object is situated at 30 cm from a convex lens of focal length 10 cm find position and nature of the image draw a ray diagram to show the image formation and also magnification

Answer 1

u=30 cm
f= 10 cm
1/v=1/f -1/u
1/v=1/10 -1/30
1/v=2/30
1/v=1/15
v=15 cm

m=v/u
m=15/30=1/2

Answer 2

u = 30cm
f = 10cm
1/v = 1/f - 1/u
1/v = 1/10 - 1/30
1/v = 2/30
1/v = 1/15
1/v = v/u
1/v = 15/30 = 1/2

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